CVE-2026-34367 InvoiceShelf: SSRF in Invoice PDF Rendering via Unsanitised HTML in Notes Field
Attackers can exploit unsanitized HTML in invoice notes to trigger server-side requests, potentially accessing internal resources or bypassing network restrictions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34367?
CVE-2026-34367 is a high-severity server-side request forgery vulnerability in InvoiceShelf, published on 31 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
InvoiceShelf is an open-source web & mobile app that helps track expenses, payments and create professional invoices and estimates. Prior to version 2.2.0, a Server-Side Request Forgery (SSRF) vulnerability exists in the Invoice PDF generation module. User-supplied HTML in the invoice Notes field is passed unsanitised to the Dompdf rendering library, which will fetch any remote resources referenced in the markup. This can be triggered via the PDF preview and email delivery endpoints. This issue has been patched in version 2.2.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-34367?
It affects 1 product.
Products include Invoiceshelf Invoiceshelf.
How do I fix CVE-2026-34367?
No fix has been published for CVE-2026-34367 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-34367 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34367 exists.
Other vulnerabilities in InvoiceShelf
Sources
Also known as GHSA-q9wx-ggwq-mcgh.